Examples with BlockBuilderAppender com.facebook.presto.util.JsonUtil.BlockBuilderAppender used on opensource projects

Example 1 with BlockBuilderAppender

use of com.facebook.presto.util.JsonUtil.BlockBuilderAppender in project presto by prestodb.

the class JsonToMapCast method specialize.

@Override
public BuiltInScalarFunctionImplementation specialize(BoundVariables boundVariables, int arity, FunctionAndTypeManager functionAndTypeManager) {
    checkArgument(arity == 1, "Expected arity to be 1");
    Type keyType = boundVariables.getTypeVariable("K");
    Type valueType = boundVariables.getTypeVariable("V");
    MapType mapType = (MapType) functionAndTypeManager.getParameterizedType(StandardTypes.MAP, ImmutableList.of(TypeSignatureParameter.of(keyType.getTypeSignature()), TypeSignatureParameter.of(valueType.getTypeSignature())));
    checkCondition(canCastFromJson(mapType), INVALID_CAST_ARGUMENT, "Cannot cast JSON to %s", mapType);
    BlockBuilderAppender keyAppender = createBlockBuilderAppender(mapType.getKeyType());
    BlockBuilderAppender valueAppender = createBlockBuilderAppender(mapType.getValueType());
    MethodHandle methodHandle = METHOD_HANDLE.bindTo(mapType).bindTo(keyAppender).bindTo(valueAppender);
    return new BuiltInScalarFunctionImplementation(true, ImmutableList.of(valueTypeArgumentProperty(RETURN_NULL_ON_NULL)), methodHandle);
}

Example 2 with BlockBuilderAppender

use of com.facebook.presto.util.JsonUtil.BlockBuilderAppender in project presto by prestodb.

the class JsonToArrayCast method specialize.

@Override
public BuiltInScalarFunctionImplementation specialize(BoundVariables boundVariables, int arity, FunctionAndTypeManager functionAndTypeManager) {
    checkArgument(arity == 1, "Expected arity to be 1");
    Type type = boundVariables.getTypeVariable("T");
    ArrayType arrayType = (ArrayType) functionAndTypeManager.getParameterizedType(StandardTypes.ARRAY, ImmutableList.of(TypeSignatureParameter.of(type.getTypeSignature())));
    checkCondition(canCastFromJson(arrayType), INVALID_CAST_ARGUMENT, "Cannot cast JSON to %s", arrayType);
    BlockBuilderAppender elementAppender = BlockBuilderAppender.createBlockBuilderAppender(arrayType.getElementType());
    MethodHandle methodHandle = METHOD_HANDLE.bindTo(arrayType).bindTo(elementAppender);
    return new BuiltInScalarFunctionImplementation(true, ImmutableList.of(valueTypeArgumentProperty(RETURN_NULL_ON_NULL)), methodHandle);
}

Example 3 with BlockBuilderAppender

use of com.facebook.presto.util.JsonUtil.BlockBuilderAppender in project presto by prestodb.

the class JsonToRowCast method specialize.

@Override
public BuiltInScalarFunctionImplementation specialize(BoundVariables boundVariables, int arity, FunctionAndTypeManager functionAndTypeManager) {
    checkArgument(arity == 1, "Expected arity to be 1");
    RowType rowType = (RowType) boundVariables.getTypeVariable("T");
    checkCondition(canCastFromJson(rowType), INVALID_CAST_ARGUMENT, "Cannot cast JSON to %s", rowType);
    List<Field> rowFields = rowType.getFields();
    BlockBuilderAppender[] fieldAppenders = rowFields.stream().map(rowField -> createBlockBuilderAppender(rowField.getType())).toArray(BlockBuilderAppender[]::new);
    MethodHandle methodHandle = METHOD_HANDLE.bindTo(rowType).bindTo(fieldAppenders).bindTo(getFieldNameToIndex(rowFields));
    return new BuiltInScalarFunctionImplementation(true, ImmutableList.of(valueTypeArgumentProperty(RETURN_NULL_ON_NULL)), methodHandle);
}